C.S. Lewis, Mere Christianity Ch. 3-4

Key Concepts/Ideas:

• Law of Human Nature (or moral law, Natural Law, Law of Decent Behavior)
  • distinguished from the laws that govern the physical world
• The Materialist View vs. The Religious View

Ch. 3-4 (New York : MacMillan Pub. Co., 1952).

Chapter 3: The Reality of the Law

...I said at the end of the first chapter*... that there were two odd things about the human race. First, that they were haunted by the idea of a sort of behaviour they ought to practise, what you might call fair play, or decency, or morality, or the Law of Nature. Second, that they did not in fact do so. Now some of you may wonder why I called this odd. It may seem to you the most natural thing in the world. In particular, you may have thought I was rather hard on the human race. After all, you may say, what I call breaking the Law of Right and Wrong or of Nature, only means that people are not perfect. And why on earth should I expect them to be?

That would be a good answer if what I was trying to do was to fix the exact amount of blame which is due to us for not behaving as we expect others to behave. But that is not my job at all. I am not concerned at present with blame; I am trying to find out truth. And from that point of view the very idea of something being imperfect, of its not being what it ought to be, has certain consequences. 

The Law of Human Nature:  not what humans in fact do, but what they should do.

If you take a thing like a stone or a tree, it is what it is and there seems no sense in saying it ought to have been otherwise. Of course you may say a stone is ‘the wrong shape’ if you want to use it for a rockery, or that a tree is a bad tree because it does not give you as much shade as you expected. But all you mean is that the stone or the tree does not happen to be convenient for some purpose of your own. You are not, except as a joke, blaming them for that. You really know, that, given the weather and the soil, the tree could not have been any different. What we, from our point of view, call a ‘bad’ tree is obeying the laws of its nature just as much as a ‘good’ one. Now have you noticed what follows? It follows that what we usually call the laws of nature—the way weather works on a tree for example—may not really be laws in the strict sense, but only in a manner of speaking. When you say that falling stones always obey the law of gravitation, is not this much the same as saying that the law only means ‘what stones always do’? You do not really think that when a stone is let go, it suddenly remembers that it is under orders to fall to the ground. You only mean that, in fact, it does fall. In other words, you cannot be sure that there is anything over and above the facts themselves, any law about what ought to happen, as distinct from what does happen. The laws of nature, as applied to stones or trees, may only mean ‘what Nature, in fact, does’. But if you turn to the Law of Human Nature, the Law of Decent Behaviour, it is a different matter. That law certainly does not mean ‘what human beings, in fact, do’; for as I said before, many of them do not obey this law at all, and none of them obey it completely. The law of gravity tells you what stones do if you drop them; but the Law of Human Nature tells you what human beings ought to do and do not. In other words, when you are dealing with humans, something else comes in above and beyond the actual facts. You have the facts (how men do behave) and you also have something else (how they ought to behave). In the rest of the universe there need not be anything but the facts. Electrons and molecules behave in a certain way, and certain results follow, and that may be the whole story. But men behave in a certain way and that is not the whole story, for all the time you know that they ought to behave differently.

Now this is really so peculiar that one is tempted to try to explain it away. For instance, we might try to make out that when you say a man ought not to act as he does, you only mean the same as when you say that a stone is the wrong shape; namely, that what he is doing happens to be inconvenient to you. But that is simply untrue. A man occupying the corner seat in the train because he got there first, and a man who slipped into it while my back was turned and removed my bag, are both equally inconvenient. But I blame the second man and do not blame the first. I am not angry—except perhaps for a moment before I come to my senses—with a man who trips me up by accident; I am angry with a man who tries to trip me up even if he does not succeed. Yet the first has hurt me and the second has not. Sometimes the behaviour which I call bad is not inconvenient to me at all, but the very opposite. In war, each side may find a traitor on the other side very useful. But though they use him and pay him they regard him as human vermin. So you cannot say that what we call decent behaviour in others is simply the behaviour that happens to be useful to us. And as for decent behaviour in ourselves, I suppose it is pretty obvious that it does not mean the behaviour that pays. It means things like being content with thirty shillings when you might have got three pounds, doing school work honestly when it would be easy to cheat, leaving a girl alone when you would like to make love to her, staying in dangerous places when you would rather go somewhere safer, keeping promises you would rather not keep, and telling the truth even when it makes you look a fool.

Summing Up

…(So the) Moral Law, or Law of Human Nature, is not simply a fact about human behaviour in the same way as the Law of Gravitation is, or may be, simply a fact about how heavy objects behave. On the other hand, it is not a mere fancy, for we cannot get rid of the idea, and most of the things we say and think about men would be reduced to nonsense if we did. And it is not simply a statement about how we should like men to behave for our own convenience; for the behaviour we call bad or unfair is not exactly the same as the behaviour we find inconvenient, and may even be the opposite. Consequently, this Rule of Right and Wrong, or Law of Human Nature, or whatever you call it, must somehow or other be a real thing—a thing that is really there, not made up by ourselves. And yet it is not a fact in the ordinary sense, in the same way as our actual behaviour is a fact. It begins to look as if we shall have to admit that there is more than one kind of reality; that, in this particular case, there is something above and beyond the ordinary facts of men’s behaviour, and yet quite definitely real—a real law, which none of us made, but which we find pressing on us.

Chapter 4: What Lies Behind the Law

[…] I now want to consider what this tells us about the universe we live in. Ever since men were able to think they have been wondering what this universe really is and how it came to be there. And, very roughly, two views have been held. First, there is what is called the materialist view. People who take that view think that matter and space just happen to exist, and always have existed, nobody knows why; and that the matter, behaving in certain fixed ways, has just happened, by a sort of fluke, to produce creatures like ourselves who are able to think. By one chance in a thousand something hit our sun and made it produce the planets; and by another thousandth chance the chemicals necessary for life, and the right temperature, occurred on one of these planets, and so some of the matter on this earth came alive; and then, by a very long series of chances, the living creatures developed into things like us. The other view is the religious view . According to it, what is behind the universe is more like a mind than it is like anything else we know. That is to say, it is conscious, and has purposes, and prefers one thing to another. And on this view it made the universe, partly for purposes we do not know, but partly, at any rate, in order to produce creatures like itself—I mean, like itself to the extent of having minds. Please do not think that one of these views was held a long time ago and that the other has gradually taken its place. Wherever there have been thinking men both views turn up. And note this too. You cannot find out which view is the right one by science in the ordinary sense. Science works by experiments. It watches how things behave. Every scientific statement in the long run, however complicated it looks, really means something like, ‘I pointed the telescope to such and such a part of the sky at 2.20 a.m. on January 15th and saw so and so,’ or, ‘I put some of this stuff in a pot and heated it to such and such a temperature and it did so and so.’ Do not think I am saying anything against science: I am only saying what its job is. And the more scientific a man is, the more (I believe) he would agree with me that this is the job of science—and a very useful and necessary job it is too. But why anything comes to be there at all, and whether there is anything behind the things science observes—something of a different kind—this is not a scientific question. If there is ‘Something Behind’, then either it will have to remain altogether unknown to men or else make itself known in some different way. The statement that there is any such thing, and the statement that there is no such thing, are neither of them statements that science can make. And real scientists do not usually make them. It is usually the journalists and popular novelists who have picked up a few odds and ends of half baked science from textbooks who go in for them. After all, it is really a matter of common sense.

Our Unique “Inside Knowledge”

Now the position would be quite hopeless but for this. There is one thing, and only one, in the whole universe which we know more about than we could learn from external observation. That one thing is Man. We do not merely observe men, we are men. In this case we have, so to speak, inside information; we are in the know. And because of that, we know that men find themselves under a moral law, which they did not make, and cannot quite forget even when they try, and which they know they ought to obey. Notice the following point. Anyone studying Man from the outside as we study electricity or cabbages, not knowing our language and consequently not able to get any inside knowledge from us, but merely observing what we did, would never get the slightest evidence that we had this moral law. How could he? for his observations would only show what we did, and the moral law is about what we ought to do. In the same way, if there were anything above or behind the observed facts in the case of stones or the weather, we, by studying them from outside, could never hope to discover it.

The position of the question, then, is like this. We want to know whether the universe simply happens to be what it is for no reason or whether there is a power behind it that makes it what it is. Since that power, if it exists, would be not one of the observed facts but a reality which makes them, no mere observation of the facts can find it. There is only one case in which we can know whether there is anything more, namely our own case. And in that one case we find there is. Or put it the other way round. If there was a controlling power outside the universe, it could not show itself to us as one of the facts inside the universe—no more than the architect of a house could actually be a wall or staircase or fireplace in that house. The only way in which we could expect it to show itself would be inside ourselves as an influence or a command trying to get us to behave in a certain way. And that is just what we do find inside ourselves. Surely this ought to arouse our suspicions? In the only case where you can expect to get an answer, the answer turns out to be Yes; and in the other cases, where you do not get an answer, you see why you do not.

Suppose someone asked me, when I see a man in blue uniform going down the street leaving little paper packets at each house, why I suppose that they contain letters? I should reply, ‘Because whenever he leaves a similar little packet for me I find it does contain a letter.’ And if he then objected—‘But you’ve never seen all these letters which you think the other people are getting,’ I should say, ‘Of course not, and I shouldn’t expect to, because they’re not addressed to me. I’m explaining the packets I’m not allowed to open by the ones I am allowed to open.’ It is the same about this question. The only packet I am allowed to open is Man. When I do, especially when I open that particular man called Myself, I find that I do not exist on my own, that I am under a law; that somebody or something wants me to behave in a certain way. I do not, of course, think that if I could get inside a stone or a tree I should find exactly the same thing, just as I do not think all the other people in the street get the same letters as I do. I should expect, for instance, to find that the stone had to obey the law of gravity—that whereas the sender of the letters merely tells me to obey the law of my human nature, he compels the stone to obey the laws of its stony nature. But I should expect to find that there was, so to speak, a sender of letters in both cases, a Power behind the facts, a Director, a Guide.

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For further thought (optional)

Listen to C.S. Lewis’ radio-broadcasted version of the essay, via the first video in the playlist below.

C.S. Lewis makes a key distinction between inside knowledge and knowledge drawn from observing the facts of the world. The following is a short “meditation” that elucidates his point:

Lewis, Meditation in a Toolshed